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Properties of Atoms. Spectra.

Problem 6.153

An atom in the state 2P1/2{ }^{2} P_{1 / 2} is located on the axis of a loop of radius r=5 cmr=5 \mathrm{~cm} carrying a current I=10I=10 A. The distance between the atom and the centre of the loop is equal to the radius of the latter. How great may be the maximum force that the magnetic field of that current exerts on the atom?

Reveal Answer
 6.153. Fmax⁡=μBmax⁡⋅∣∂B/∂z∣=(3/8)πIgJμB/cr2==4⋅10−27 N.\begin{aligned} & \text { 6.153. } F_{\max }=\mu_{B} \max \cdot|\partial B / \partial z|=(3 / \sqrt{8}) \pi I g J \mu_{B} / c r^{2}=\\ =& 4 \cdot 10^{-27} \mathrm{~N} . \end{aligned}
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